CN106681795A - Virtual network mapping method utilizing local topological attributes of nodes and available resource capacity values - Google Patents
Virtual network mapping method utilizing local topological attributes of nodes and available resource capacity values Download PDFInfo
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- CN106681795A CN106681795A CN201611126590.8A CN201611126590A CN106681795A CN 106681795 A CN106681795 A CN 106681795A CN 201611126590 A CN201611126590 A CN 201611126590A CN 106681795 A CN106681795 A CN 106681795A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
- G06F2009/45595—Network integration; Enabling network access in virtual machine instances
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Abstract
The invention discloses a virtual network mapping method utilizing local topological attributes of nodes and available resource capacity values. The virtual network mapping method comprises the steps that networking is conducted on a shared cloud computing system or equipment at data center to form a shared physical network; a virtual network request is generated according to the demand of a user; the virtual network request is mapped into the shared physical network to complete resource task scheduling represented by the virtual network request, accordingly a physical sub-network logically isomorphic with the virtual network request is obtained, and finally the physical sub-network is fed back to the user; based on the local topological attributes of the nodes and the available resource capacity values, the importance degree of the equipment is balanced, a greedy strategy is preferentially applied to map most important virtual devices to physical devices having the most adequate resource capacity, the processes of device mapping and link mapping are coordinated, and the acceptance rate of the virtual network request is improved to achieve the technical effect of improving physical network resource utilization efficiency.
Description
Technical field
The present invention relates to a kind of task scheduling of cloud computing system, more particularly, refers to that one kind is opened up using node local
Flutter the mapping method of virtual network of attribute and available resources capability value.The present invention is mapped to the virtual network of multiple isomeries altogether
In the physical network enjoyed, to improve the technology of physical network resource utilization ratio.This is a kind of for realizing network virtualization
Key, in being widely used in cloud computing and data center.
Background technology
Cloud computing (Clond Computing) is grid computing (Grid Computing), Distributed Calculation
(Distributed Computing), parallel computation (Parallel Computing), effectiveness calculate (Utility
Computing) network storage (Network Storage Technologies), virtualization (Virtualization), load
Traditional computer technologies such as balanced (Load Balance) and the product of network technical development fusion.It is intended to by network many
The computational entity of individual advantage of lower cost be integrated into one have powerful calculating ability perfect system, and by SaaS, PaaS,
IaaS, MSP etc. advanced business model is distributed to this powerful computing capability in terminal use's handss.Clond Computing
A core concept be exactly by improve constantly " cloud " disposal ability, and then reduce user terminal processing load, finally
Make user terminal be simplified to a simple input-output equipment, and can on demand enjoy the powerful calculating disposal ability of " cloud ".
In the architecture of cloud computing (Clond Computing), cloud computing is divided into four layers：Physical resource, resource pool, pipe
Reason middleware, SOA layers.With reference to《Cloud computing application technology》, Wan Chuanmei, page 10, August the 1st edition in 2013.Cloud computing system is tied
Hereinafter shown in Fig. 1, middleware management level are mainly responsible for management, the scheduling of task, user management and the bursting tube of resource to composition
Reason etc..Wherein, the scheduling problem of resource is the key problem in resource management.
Network virtualization technology, as the key technology of the rigid problem that can be used to solve internet, in cloud computing
In be used widely.Virtual network mapping problems, is for realizing one of key issue of network virtualization.In order to solve void
Intend network mapping problem, currently existing many research worker are studied virtual network mapping techniques.
Whether the independent stage is divided into according to virtual network mapping process interior joint mapping phase and link maps stage, can
Virtual network mapping algorithm is divided into into two classes：Virtual network mapping algorithm comprising two stages and virtual comprising stage
Network mapping algorithm.
1) only the virtual network mapping algorithm comprising a stage is referred to node mapping and link maps fusion same
The virtual network mapping algorithm that the individual stage is realized, using the thought node that constantly retrospective search can be matched and chain of Subgraph Isomorphism
Road.If its advantage is the presence of solution, one is set to feasible solution, because just already having accounted for the limit of link while node is considered
System；Have the disadvantage that time complexity is high.
2) the virtual network mapping algorithm comprising two stages refers to dummy node mapping phase and virtual link mapping rank
Section stands alone as the virtual network mapping algorithm in two stages.Being mapped to dummy node first with greedy strategy may meet condition
Physical node on；After node matching success, then look for available meeting virtual chain between the physical node for being mapped
The physical link of road demand.This algorithm for node and link maps are divided into into two separate phases carrying out is easily caused in link
Failure in mapping process, and these failures are caused often caused by there is no link between selected node.
In order to preferably virtual network mapping techniques be applied to into high-performance cloud computing system, only comprising the void in a stage
Plan network mapping Algorithms T-cbmplexity is too high, and the accuracy rate of the virtual network mapping algorithm comprising two nodes is inadequate, if adopting
With global topological attribute come coordinator node mapping and link maps stage, amount of calculation is larger.
The content of the invention
The invention aims to solve the problems, such as that important virtual unit easily maps failure, to improve physical network in
The utilization ratio of resource, receives more virtual network requests, and proposes a kind of using node local topology attribute and available
The mapping method of virtual network of resource capacity value.The inventive method is according to the judgement to equipment significance level, by virtual network
Virtual unit in request is arranged according to significance level descending, is preferentially mapped to most important virtual unit with greedy strategy
On the most sufficient physical equipment of resource capacity, coordinate the process of device map and link maps, improve virtual network requests
Receptance, with reach improve physical network resource utilization ratio technique effect.It is super that the inventive method can be applied to E levels
In computer new architecture.
The present invention is the mapping method of virtual network of a kind of utilization node local topology attribute and available resources capability value,
The mapping method of virtual network includes following four step：
Step one：The network equipment in cloud computing system is carried out into networking and obtains shared physical network；
The network equipment in the cloud computing system is router, server and/or switch；
Step 2：Virtual network requests are generated according to user's request；
Step 3：Generate the physical subnets with virtual request cellular logic isomorphism；
Step 4：The physical subnets that step 3 is obtained are fed back to into user；
The virtual request network of the generation includes NR、LRWithIt is designated as using aggregate formGRRepresent virtual request network；NRExpression belongs to virtual request network GRMiddle virtual unit
Set；Expression belongs to NRVirtual unit attribute set；LRExpression belongs to virtual request network GRMiddle virtual link
Set；Expression belongs to LRVirtual link attribute set；
It is that virtual network requests are mapped in shared physical network, to complete virtual network requests in step 3
Representative resource tasks scheduling, so as to obtain the physical subnets with virtual network requests logic isomorphism；
Resource tasks scheduling is the virtual network requests G to being generated by user's requestRBy calling shared physical networkIn corresponding equipment and resource, generation be isomorphic to reflection user's request virtual network
The physical subnets network of requestTask needed for for carrying out user
Deng.G is can be described as with Formal LanguagesR→GS′, wherein, efficient scheduling need to meet selected physical subnets network GS′With it is virtual
Network request GRThe attribute of equipment, the being consistent property of annexation between the attribute of link and equipment.
In, GS′Represent physics sub-network；NS′Expression belongs to GS′Middle physical equipment
Set；Expression belongs to NS′Physical equipment attribute set；LS′Expression belongs to GS′The set of middle physical link；
Expression belongs to LS′Physical link attribute set.
The virtual network mapping includes device map step and link maps step.
In the present invention, the device map step of the resource tasks scheduling is；
Step 1-1, to physical network GSIn belong to NSAny one physical equipmentS represents the mark of physical equipment, meter
Calculate the physical equipmentResource capacity
Step 1-2, to virtual network requests GRIn belong to NRAny one virtual unitR represents the mark of virtual unit
Will, calculates the virtual unitResource capacityThe virtual unit is calculated againImportance value
Step 1-3, according to step 1-1 to physical network GSIn all physical equipments According to resource capacity valueDescending sort is carried out, physical equipment after being sorted Represent to NSAccording to the physical equipment collection of resource capacity value descending sort；
Step 1-4, according to step 1-2 to virtual network requests GRIn all virtual units According to importance valueDescending sort is carried out, virtual unit after being sorted Represent to NRAccording to the virtual of importance value descending sort
Equipment collection；
Step 1-5, by Jing after the process of step 1-4Sequentially successively
It is mapped to Jing after the process of step 1-3On, to belonging to In any one virtual unit carry out and belong to according to device map conditionIn physical equipment mapped one by one, acquisition meet device map bar
The physical equipment collection of part
If belonging toThe virtual unit that has can not find satisfaction
The physical equipment of device map condition, thenIt is designated as sky；Need to wait for physical network GSThe enough resources of release, could enter down
The device map in one cycle；IfIt is not sky, then shows all to belong to NRVirtual unitMapping is completed, record reflects
Result is penetrated, incoming link mapping phase of going forward side by side；
The device map condition is
In the present invention, the link maps step of the resource tasks scheduling is；
Step 2-1, judgesWithBetween whether there is direct-connected met virtual linkVirtual link attribute
The physical link of constraints；IfWithBetween there is direct-connected met virtual linkVirtual link attribute about
The physical link of beam condition, then it is assumed that virtual linkIt is mapped to physical network GSThe physical link collection of gainedThen haveIfWithBetween there is no direct-connected met virtual link
Virtual link attribute constraint condition physical link, then into step 2-2；
Step 2-2, ifWithBetween there is no direct-connected met virtual linkVirtual link attribute constraint
The physical link of condition, foundation existsWithBetween shortest path find and meet the physical link collection of conditionIf physical link collection LP_t′For sky, then virtual linkFor mapping
Failure, returns without solution；If physical link collection LP_t′For non-NULL, then it is assumed that virtual linkTo map successfully, the result of link maps
It is designated asFinally virtual network mapping result is returned to into user.
The present invention is using node local topology attribute and the advantage of the mapping method of virtual network of available resources capability value
It is：
1. using the local topology attribute and resource capacity of virtual unit in virtual network requests, rather than the topology of the overall situation
Attribute, reduces time complexity.
2. device map is separated with link maps in virtual network mapping, and the high virtual unit of significance level is excellent
First carry out being mapped to physical equipment, coordinated device map and link maps process, enabling be rapid in cloud data center
Device map process and link maps process are completed, the automatic dispatching of resource is reached.
3. in the inventive method only with the disposal ability of equipment as attribute constraint condition carrying out the mapping of virtual unit, fill
Divide the measurement index of the significance level that make use of virtual unit, coordinate device map and link maps.In device map process
Middle that important virtual unit is preferentially mapped on the sufficient resource capacity of resource capacity, improve the successful of device map can
Can property.
In the present invention, 4. the mapping for only virtual link being carried out with a width of attribute constraint of the band of link, based on device map
The result of process, using the method Rapid matching of shortest path the physical link of condition is met, so as to by device map and link
Mapping is organically combined, and reduces the probability of link maps failure, is reached in the physical equipment for meeting virtual unit attribute constraint
Between physical link Rapid matching.
Description of the drawings
Fig. 1 is conventional cloud counting system structure chart.
Fig. 2 is the mapping schematic diagram of virtual network.
Fig. 3 is the present invention according to physical network and the flow chart of virtual request network struction physical subnets.
Fig. 4 is the flow chart of present device mapping and link maps.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Physical network (substrate network)：
In the present invention, physical network (such as Fig. 2) represents that physical network is by with process energy using undirected weighted graph
The network equipment (such as router, server and/or switch) composition in the cloud computing system of power, using aggregate form expression thing
Reason network is designated asS represents the mark of physical network, GSRepresent physical network；NSRepresent category
In physical network GSThe set of middle physical equipment；Expression belongs to NSPhysical equipment attribute set, the present invention only consider
The disposal ability of node；LSExpression belongs to physical network GSThe set of middle physical link；Expression belongs to LSPhysical link category
Property set, the present invention only consider link bandwidth.Four set more than introducing in turn below.
NSExpression belongs to physical network GSThe set of middle physical equipment.Assume physical network GSTotal K equipment, k is represented and appointed
Anticipate the identification number of a physical equipment, k ∈ K.S represents the mark of physical equipment
Will.
Represent first physical equipment in physical network.
Represent second physical equipment in physical network.
Represent any one physical equipment in physical network.
Represent physical network inAn adjacent physical equipment, referred to as previous physical equipment.
Represent physical network inAnother adjacent physical equipment, referred to as latter physical equipment.
Represent last physical equipment in physical network.
Due to the port number on each physical equipment it is not necessarily identical, the input port of same physical equipment and output
Port is not necessarily identical.In the present invention, it is assumed that can be by the port abstraction of physical equipment using means such as Intel Virtualization Technologies
It is infinite multiple, therefore do not consider whether the port of physical equipment is enough in the present invention, do not emphasize available port-mark number yet
Deng.
Expression belongs to NSPhysical equipment attribute set,
Type represents that the type of the physical equipment in the physical network, Num represent physical equipment unoccupied end in the physical network
The number of mouth, Attribute represents the attribute of the unoccupied port of physical equipment in the physical network, and AvailNum represents institute
State the disposal ability of physical equipment in physical network.It is (general to consider due to being directed to same physical equipment in the present invention
Be router), therefore do not consider type, port number and the port attribute of physical equipment, then
Only consider disposal ability AvailNum of physical equipment, the numerical value unit of AvailNum is designated as 1.WithRepresent institute
State physical equipmentDisposal ability.Citing, ifThen represent first physical equipmentProcess
Ability is 10 units.
LSExpression belongs to physical network GSThe set of middle physical link.In the present invention, chain is represented using aggregate form
Road, it is assumed that total T bar links, t represents the identification number of physical link, then
Represent first physical link in physical network.Citing,Refer to by physical equipmentWith thing
Reason equipmentThe physical link of composition.
Represent the Article 2 physical link in physical network.Citing,Refer to by physical equipmentWith thing
Reason equipmentThe physical link of composition.
Represent any one physical link in physical network.Citing,Refer to by physical equipmentWith
Physical equipmentThe physical link of composition.OrRefer to by physical equipmentWith physical equipmentStructure
Into physical link.
Represent physical network inAn adjacent physical link, referred to as previous bar physical link.
Represent physical network inAnother adjacent physical link, referred to as latter bar physical link.
Represent the last item physical link in physical network.
Wherein, due to physical network GSIn link be it is nondirectional, i.e.,：IfThenIf representingWithConnected two end points are identical, are same link, and the attribute of link should be identical.Any two thing
Reason equipment, is set toWithLink number between them is up to 1.
Expression belongs to LSPhysical link attribute,Represent the physical network GSIn chain
The attribute on roadOnly consider bandwidth Width of physical link, the numerical value unit of Width is designated as 1.WithRepresent institute
State physical linkBandwidth.Citing, ifThen represent a width of 100 lists of band of first physical link
Position.
Virtual network requests (virtual network request)：
In the present invention, virtual network requests describe virtual net similar to the description of physical network using aggregate form
Network request is designated asR represents the mark of virtual network, GRRepresent virtual network requests；NRTable
Show and belong to virtual network requests GRThe set of middle virtual unit；Expression belongs to NRVirtual unit attribute set；LRRepresent
Belong to virtual network requests GRThe set of middle virtual link；Expression belongs to LRVirtual link attribute set.Below according to
More than secondary introduction four set.
NRExpression belongs to virtual network requests GRThe set of middle virtual unit.Assume virtual network requests GRTotal K ' is individual to be set
Standby, k ' represents the identification number of any one virtual unit, k ' ∈ K '.R tables
Show the mark of virtual unit.
Represent first virtual unit in virtual network requests.
Represent second virtual unit in virtual network requests.
Represent any one virtual unit in virtual network requests.
Represent virtual network requests inAn adjacent virtual unit, referred to as previous virtual unit.
Represent virtual network requests inAnother adjacent virtual unit, referred to as latter virtually sets
It is standby.
Represent last virtual unit in virtual network requests.
Expression belongs to NRVirtual unit attribute set,
Type ' represents the type of the virtual unit in the virtual request network, and Num represents virtual unit in the virtual request network
The number of unoccupied port, the attribute of the unoccupied port of virtual unit in virtual request network described in Attribute,
AvailNum represents the disposal ability of virtual unit in the virtual network requests.It is same due to being directed in the present invention
Virtual unit, therefore do not consider type, port number and the port attribute of virtual unit, thenOnly
Consider disposal ability size AvailNum of virtual unit, the numerical value unit of AvailNum is designated as 1.WithTable
Show the physical equipmentDisposal ability.Citing, ifThen represent first virtual unit's
Disposal ability is 10 units.
LRExpression belongs to virtual network requests GRThe set of middle virtual link.In the present invention, represented using aggregate form
Link, it is assumed that total T ' bar links, t ' represents the identification number of virtual link, then
Represent first virtual link in virtual network requests.Citing,Refer to by physical equipment
With physical equipmentThe physical link of composition.
Represent the Article 2 virtual link in virtual network requests.Citing,Refer to by physical equipment
With physical equipmentThe physical link of composition.
Represent any one virtual link in virtual network requests.Citing,Refer to by physical equipmentWith physical equipmentThe physical link of composition.OrRefer to by physical equipmentWith physical equipmentThe physical link of composition.
Represent virtual network requests inAn adjacent virtual link, referred to as previous bar virtual link.
Represent virtual network requests inAnother adjacent virtual link, referred to as latter bar virtual link.
Represent the last item virtual link in virtual network requests.
Wherein, due to virtual network requests GRIn link be it is nondirectional, i.e.,：If ThenRepresentWithConnected two end points are identical, are same link, and link attribute should be identical.
Any two virtual unit, is set toWithLink number between them is up to 1.
Expression belongs to LRVirtual link attribute,Represent the virtual network requests GRIn
Link attributeOnly consider bandwidth Width of virtual link, the numerical value unit of Width is designated as 1.WithRepresent
The virtual linkBandwidth.Citing, ifThen represent a width of 100 lists of band of first virtual link
Position.
Shown in Figure 3, the present invention proposes a kind of utilization node local topology attribute and available resources capability value
Mapping method of virtual network, it includes the following steps：
Step one：Equipment in shared cloud computing system is carried out into networking and obtains shared physical network；
The network equipment in the cloud computing system can be router, server and/or switch.
Step 2：Virtual network requests are generated according to user's request；
Virtual network requests are designated asGRRepresent virtual network requests；NRExpression belongs to
Virtual network requests GRThe set of middle virtual unit；Expression belongs to NRVirtual unit attribute set；LRExpression belongs to empty
Intend network request GRThe set of middle virtual link；Expression belongs to LRVirtual link attribute set.
Step 3：Virtual network requests are mapped in shared physical network, to complete representated by virtual network requests
Resource tasks scheduling, so as to obtain the physical subnets with virtual network requests logic isomorphism；
In the present invention, resource tasks scheduling is the virtual network requests to being generated by user's requestBy calling shared physical networkIn it is corresponding
Equipment and resource, generation be isomorphic to reflection user's request virtual network requests physical subnets networkTask dispatching needed for for carrying out user.Use Formal Languages
Can be described as：GR→GS′, wherein, efficient scheduling need to meet selected physical subnets network GS′With virtual network requests GRSet
Standby attribute, the being consistent property of annexation between the attribute of link and equipment.
In, GS′Represent physics sub-network；NS′Expression belongs to GS′Middle physical equipment
Set；Expression belongs to NS′Physical equipment attribute set；LS′Expression belongs to GS′The set of middle physical link；Table
Show and belong to LS′Physical link attribute set.
The virtual network mapping includes device map step and link maps step.
Step 4：The physical subnets that step 3 is obtained are fed back to into user.
In the processing procedure of the step three of the present invention, virtual network requests are mapped to into shared physical network process
In, for belonging to same virtual network requests GREquipment collection NRIn two different virtual units, be designated asWithr
The mark of virtual unit is represented, thenWithThe physical equipment for being mapped should be differed.Citing, willThe physics of mapping sets
It is standby to be designated asWillThe physical equipment for being mapped is designated asS represents the mark of physical equipment.
For any one virtual unitIf its physical equipment for being mapped is designated asThenAttribute constraint with's
Attribute constraint needs to meet
For any one virtual linkIfIfThe virtual unit at two endsWithReflected
The physical equipment penetrated isWith The physical link for being mappedIt is described
Middle ellipsis showsWithBetween may pass through other intermediate physical equipment, to constitute satisfactionVirtual link category
The physical link of property constraints.
The maximum number for assuming to allow the intermediate physical equipment for passing through is Q equipment, and q represents any one intermediate physical equipment
Identification number, q ∈ Q, Q >=0, Q ＜ K.The middle physical equipment for passing through is described with aggregate form, is designated asNPBe through intermediate physical equipment collection,
Represent the first intermediate physical equipment for passing through；
Represent the second intermediate physical equipment for passing through；
Represent any one the intermediate physical equipment for passing through；
Represent withAn adjacent intermediate physical equipment；Referred to as previous intermediate physical equipment；
Represent withAnother adjacent intermediate physical equipment, referred to as latter intermediate physical equipment
Represent last the intermediate physical equipment for passing through.
In the present invention, N is belonged to for any onePIn intermediate physical equipmentHave The physical link for being mappedThrough intermediate physical set
Standby disposal ability is respectively less than virtual unitWithDisposal ability.
In the present invention, for virtual network requests GRIn belong to LRArbitrary virtual linkRetouched with the form of set
State the virtual linkThe physical link of mappingAssume to allow the physical link for passing through to be up to M,
M represents the identification number of the physical link of any one mapping, m ∈ M.The connected composition of two equipment is route according to chain, it is known that M=Q+1.
Described with aggregate formIt is mapped to physical network GSIn physical link collection, be designated as Wherein LP_t′For the physical link collection for being mapped.
RepresentIt is mapped to physical network GSThe physical link collection L of middle gainedP_t′In first physical link.Lift
Example,Refer to by physical equipmentWith physical equipmentThe physical link of composition.
RepresentIt is mapped to physical network GSThe physical link collection L of middle gainedP_t′In Article 2 physical link.Lift
Example,Refer to by physical equipmentWith physical equipmentThe physical link of composition.
RepresentIt is mapped to physical network GSThe physical link collection L of gainedP_t′In any one physical link.Lift
Example,Refer to by physical equipmentWith physical equipmentThe physical link of composition.
RepresentIt is mapped to physical network GSThe physical link collection L of gainedP_t′In withAn adjacent physics chain
Road, the physical link of referred to as previous bar mapping.
RepresentIt is mapped to physical network GSThe physical link collection L of gainedP_t′In withAnother adjacent physics
Link, the physical link of referred to as latter bar mapping.
RepresentIt is mapped to physical network GSThe physical link collection L of gainedP_t′In the last item physical link.Lift
Example,Refer to by physical equipmentWith physical equipmentThe physical link of composition.
When physical equipment maximum number Q=0 of middle process,It is mapped to physical network GSIn
Physical link collectionNowWhereinThe virtual unit at two endsWithReflected
The physical equipment penetrated isWithNow, centre is without any other physical equipment.
In the present invention, for any one virtual linkThe virtual linkIt is mapped to physical network GSThe thing of gained
Reason link set LP_t′In any one physical linkHaveThat is virtual linkMapping institute
The physical link collection L of mappingP_t′In any one physical link bandwidth be all higher than be equal to virtual linkBandwidth.
In the present invention, if the virtual linkIt is mapped to physical network GSThe physical link collection L of gainedP_t′In certain
One physical linkBandwidthNow think that other suitable physical links cannot be found
To meet condition, now by LP_t′It is designated as empty set.
In the present invention, the resource capacity value of node and the resource capacity value sum conduct of nearest neighbor node be make use of
The index of the significance level of the node, using the index significance level of virtual unit in virtual network is calculated, and will be most important
Virtual unit be preferentially mapped on the most sufficient physical equipment of resource capacity.With n (n ∈ NSOr n ∈ NR) represent an equipment
(either physical equipment or virtual unit), can be with the disposal ability of the equipment and all links with the equipment as one end
The value of the product of bandwidth is representing the resource capacity of equipment；The resource capacity of arbitrary equipment is designated as H (n), thenAvailNum (n) represents the disposal ability of equipment n, and L is represented by equipment n
The link set of composition, l represents any one link for belonging to L, and l ∈ L, Width (l) represents the bandwidth of link l.It is described by equipment
The link that n is constituted refers to one end that equipment n is link.
In the present invention, using equipment n own resources capacity and its resource capacity value sum of nearest neighbor device
It is used as weighing the significance level of the equipment n, is represented with node importance value SumH (n), thenNeigh (n) represents the nearest neighbor device collection of equipment n, and u is represented and belonged to
Any one nearest neighbor device in Neigh (n),The money of the nearest neighbor device of expression equipment n
Source capability value sum.
In the present invention, by the use of equipment local topology attribute and resource capacity value as equipment significance level, preferentially
Most important virtual unit is mapped on the most sufficient physical equipment of resource capacity, to improve the success rate of mapping, so as to carry
The utilization ratio of high physical resource.
Shown in Figure 4, in the present invention, virtual network mapping includes device map step and link maps step.
The device map step is：
Step 1-1, to physical network GSIn belong to NSAny one physical equipmentCalculate the physical equipmentMoney
Source capacity
Step 1-2, to virtual network requests GRIn belong to NRAny one virtual unitCalculate the virtual unit
Resource capacityThe virtual unit is calculated againImportance value
Step 1-3, according to step 1-1 to physical network GSIn all physical equipments According to resource capacity valueDescending sort is carried out, physical equipment after being sorted Represent to NSAccording to the physical equipment collection of resource capacity value descending sort；
Step 1-4, according to step 1-2 to virtual network requests GRIn all virtual units According to importance valueDescending sort is carried out, virtual unit after being sorted Represent to NRAccording to the virtual of importance value descending sort
Equipment collection；
Step 1-5, by Jing after the process of step 1-4Sequentially successively
It is mapped to Jing after the process of step 1-3On, to belonging to In any one virtual unit carry out and belong to according to device map conditionIn physical equipment mapped one by one, acquisition meet device map bar
The physical equipment collection of part
RepresentAccording to the physical equipment collection of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
If belonging toThe virtual unit that has can not find satisfaction
The physical equipment of device map condition, thenIt is designated as sky；Need to wait for physical network GSThe enough resources of release, could enter
The device map in next cycle；IfIt is not sky, then shows all to belong to NRVirtual unitComplete mapping, record
Mapping result, incoming link mapping phase of going forward side by side.
In the present invention, the device map condition is
In the present invention, it is to meet physical equipment to be mapped using the process of step 1-5With virtual unit
In physical equipment arbitrarily to be mappedDisposal ability be more than or equal to virtual unitDisposal ability.Meanwhile, according to step
The process of rapid 1-5, preferentially can be mapped to significance level high virtual unit on the big physical equipment of resource capacity value, so that
Important virtual unit is preferentially mapped, so as to solve the possibility of the device map failure that important virtual unit may bring
The big problem of property.
The link maps step is：
In the present invention, it is to virtual unit in link maps processIn
Each virtual link is matched one by one, need to judge describedIn equipment
Gained in mappingWhether corresponding physical link can meet void
Intend the virtual link attribute constraint condition of link.
In the present invention, virtual link attribute constraint condition refers to that the virtual unit at any one virtual link two ends is reflected
The physical link collection for being mapped between the physical equipment penetrated, for constituting the attribute constraint for meeting the virtual linkIn any one physical linkBandwidth should be greater than
In the bandwidth of the virtual unit, i.e.,
The matching process one by one of each virtual link for convenience of explanation, with virtual request network GRIn belong to LRAppoint
One virtual link(pressing the number order of virtual link), lookup can meet virtual linkVirtual link attribute constraint bar
PartPhysical link collection LP_t′：IfIn the present invention, only considerWithBetween link
Number is 1 situation, according to the returned result of device map process, it is assumed thatWith
Step 2-1, judgesWithBetween whether there is direct-connected met virtual linkVirtual link attribute
The physical link of constraints；IfWithBetween there is direct-connected met virtual linkVirtual link attribute about
The physical link of beam condition, then it is assumed that virtual linkIt is mapped to physical network GSThe physical link collection of gainedThen haveIfWithBetween there is no direct-connected met virtual link
Virtual link attribute constraint condition physical link, then into step 2-2；
Step 2-2, ifWithBetween there is no direct-connected met virtual linkVirtual link attribute constraint
The physical link of condition, exists with shortest path firstWithBetween find and can meet the physical link collection of conditionIf physical link collection LP_t′For sky, then virtual linkFor mapping
Failure, returns without solution；If physical link collection LP_t′For non-NULL, then it is assumed that virtual linkTo map successfully, the result of link maps
It is designated asFinally virtual network mapping result is returned to into user.
The present invention is the mapping method of virtual network of a kind of utilization node local topology attribute and available resources capability value,
To be solved is the technical problem that the high virtual unit of significance level in virtual network requests easily maps failure, the method
Carry out the significance level of weighing device by using the local topology attribute and resource capacity of equipment, and important virtual unit is excellent
First it is mapped on the sufficient physical equipment of resource capacity, has coordinated the process of device map and link maps, improves virtual net
The receptance of network request, to reach the technique effect for improving physical network resource utilization ratio.
Claims (7)
1. the mapping method of virtual network of a kind of utilization node local topology attribute and available resources capability value, the virtual net
Network mapping method includes following four step：
Step one：The network equipment in cloud computing system is carried out into networking and obtains shared physical network；
The network equipment in the cloud computing system is router, server and/or switch；
Step 2：Virtual network requests are generated according to user's request；
Step 3：Generate the physical subnets with virtual request cellular logic isomorphism；
Step 4：The physical subnets that step 3 is obtained are fed back to into user；
It is characterized in that：
The virtual request network of the generation includes NR、LRWithIt is designated as using aggregate formGRRepresent virtual request network；NRExpression belongs to virtual request network GRMiddle virtual unit
Set；Expression belongs to NRVirtual unit attribute set；LRExpression belongs to virtual request network GRMiddle virtual link
Set；Expression belongs to LRVirtual link attribute set；
It is that virtual network requests are mapped in shared physical network in step 3, to complete virtual network requests institute's generation
The resource tasks scheduling of table, so as to obtain the physical subnets with virtual network requests logic isomorphism；
Resource tasks scheduling is the virtual network requests G to being generated by user's requestRBy calling shared physical networkIn corresponding equipment and resource, generation be isomorphic to reflection user's request virtual network
The physical subnets network of request Task needed for for carrying out user；
G is can be described as with Formal LanguagesR→GS′, wherein, efficient scheduling need to meet selected physical subnets network GS′And virtual net
Network asks GRThe attribute of equipment, the being consistent property of annexation between the attribute of link and equipment；
In, GS′Represent physics sub-network；NS′Expression belongs to GS′The collection of middle physical equipment
Close；Expression belongs to NS′Physical equipment attribute set；LS′Expression belongs to GS′The set of middle physical link；Represent
Belong to LS′Physical link attribute set；
The virtual network mapping includes device map step and link maps step.
2. the virtual network mapping of utilization node local topology attribute according to claim 1 and available resources capability value
Method, it is characterised in that：The device map step of resource tasks scheduling is；
Step 1-1, to physical network GSIn belong to NSAny one physical equipmentS represents the mark of physical equipment, calculates institute
State physical equipmentResource capacity
Step 1-2, to virtual network requests GRIn belong to NRAny one virtual unitR represents the mark of virtual unit, meter
Calculate the virtual unitResource capacityThe virtual unit is calculated againImportance value
Step 1-3, according to step 1-1 to physical network GSIn all physical equipments
According to resource capacity valueDescending sort is carried out, physical equipment after being sorted Represent to NSAccording to the physical equipment collection of resource capacity value descending sort；
Step 1-4, according to step 1-2 to virtual network requests GRIn all virtual units
According to importance valueDescending sort is carried out, virtual unit after being sorted Represent to NRAccording to the virtual unit collection of importance value descending sort；
Step 1-5, by Jing after the process of step 1-4Sequentially it is sequentially mapped to Jing steps
After rapid 1-3 is processedOn, to belonging to
In any one virtual unit carry out and belong to according to device map conditionIn
Physical equipment mapped one by one, acquisition meets the physical equipment collection of device map condition
RepresentAccording to the physical equipment collection of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
Expression belongs to'sAccording to the physical equipment of device map condition coupling mapping；
If belonging toHave a virtual unit to find to meet equipment
The physical equipment of mapping condition, thenIt is designated as sky；Need to wait for physical network GSThe enough resources of release, could enter next week
The device map of phase；IfIt is not sky, then shows all to belong to NRVirtual unitComplete mapping, record mapping knot
Really, go forward side by side incoming link mapping phase；
The device map condition is
3. the virtual network mapping of utilization node local topology attribute according to claim 1 and available resources capability value
Method, it is characterised in that：The link maps step of resource tasks scheduling is；
Step 2-1, judgesWithBetween whether there is direct-connected met virtual linkVirtual link attribute constraint
The physical link of condition；IfWithBetween there is direct-connected met virtual linkVirtual link attribute constraint bar
The physical link of part, then it is assumed that virtual linkIt is mapped to physical network GSThe physical link collection of gainedThen
HaveIfWithBetween there is no direct-connected met virtual linkVirtual link attribute about
The physical link of beam condition, then into step 2-2；
Step 2-2, ifWithBetween there is no direct-connected met virtual linkVirtual link attribute constraint condition
Physical link, according to existWithBetween shortest path find and meet the physical link collection of conditionIf physical link collection LP_t′For sky, then virtual link ′To reflect
It is lost to lose, return without solution；If physical link collection LP_t′For non-NULL, then it is assumed that virtual linkTo map successfully, the knot of link maps
Fruit is designated asFinally virtual network mapping result is returned to into use
Family.
4. the virtual network mapping of utilization node local topology attribute according to claim 1 and available resources capability value
Method, it is characterised in that：Virtual network requests are mapped in shared physical network, being please to belonging to same virtual network
Seek GREquipment collection NRIn two different virtual units.
5. the virtual network mapping of utilization node local topology attribute according to claim 1 and available resources capability value
Method, it is characterised in that：The scheduling of resource of virtual network requests separately carries out device map and link maps, but excellent
First the high virtual unit of significance level is mapped on physical equipment.
6. the virtual network mapping of utilization node local topology attribute according to claim 1 and available resources capability value
Method, it is characterised in that：Physical network only considers the disposal ability of physical equipment itself and the bandwidth of physical link.
7. the virtual network mapping of utilization node local topology attribute according to claim 1 and available resources capability value
Method, it is characterised in that：Virtual network only considers the disposal ability of virtual unit itself and the bandwidth of virtual link.
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